Staff Software Engineer

This is the most senior engineering role in the company. You will own Demand end-to-end - the product surface that drives revenue, growth, and customer love - across mobile, web, and backend. You'll lead a team of ~5 engineers in London, report into our CTO, Sanket Agarwal (ex-Google, Postmates), and partner deeply with Product and Design.

If it impacts buyer conversion, retention, or growth velocity - you own it.

Why This Role Stands Out

Demand is the most commercially important function at Fleek. You won't be a Staff engineer who advises from the sidelines - you'll own the entire system that converts supply into revenue.

Fleek is digitising an industry that has never had technology. There are no existing playbooks for building a transaction layer around secondhand fashion at wholesale scale - where every item is unique, inventory is unpredictable, quality is graded by AI, and the supply chain spans three continents. You will be designing how this market works.

Your systems will handle 500,000+ items a month today and millions by the end of the year. You'll work closely with our data and AI teams to build the services that connect FleekSort's classification engine to the marketplace experience. You'll set the technical standard for the entire engineering org.

For the first six months, you'll be deeply hands-on - writing production code, owning critical threads, and building context. As foundations stabilise, your impact shifts to direction-setting, multiplying team output, and building an engineering system that scales technically and organisationally. The goal is not to stop coding. The goal is to build an organisation that doesn't depend on you coding., * System-Level Thinker: You see the full picture - from the UI a buyer touches, through the API, the data layer, and the infrastructure underneath. You make architectural decisions that compound speed, not just solve today's problem.

• Product-Obsessed Leader: You think about why a buyer drops off at checkout, not just how the checkout service is architected. You instinctively connect technical decisions to commercial outcomes.
• Builder Who Leads: You set direction by shipping, not by presenting. You write code, review code, and raise the bar through demonstration - not delegation.
• Comfortable with Ambiguity: We're building systems for workflows that didn't exist before Fleek. You thrive when the problem is undefined, the scope is broad, and you need to define the path yourself.
• Talent Multiplier: You turn good engineers into great ones. You set standards, create leverage, and build a team that ships without heroics.
• Startup Pace: You've worked in environments where shipping matters more than perfection, where you deploy daily, and where velocity is a competitive advantage., * Own the Demand System End-to-End: Design and build the full stack behind the Demand funnel - mobile app, web platform, core backend services, APIs, search, discovery, purchase flows, experimentation foundations, and analytics. These are the product features that directly drive GMV.
• Lead a High-Performance Team: Lead and develop ~5 engineers. Set technical direction, execution cadence, and engineering standards. Raise talent density through hiring and mentorship. Your job is to turn a good team into an elite one.
• Integrate AI into the Product: Build the services that connect FleekSort's AI classification engine to the marketplace experience - ensuring grading, pricing, and categorisation flow seamlessly into listings, search, and buyer workflows.
• Create Engineering Leverage: Remove structural bottlenecks across the Demand stack. Define clean ownership boundaries and platform primitives. Establish observability, release discipline, and performance guardrails. Build systems that compound iteration speed.
• Shape Technical Direction: Set architectural decisions across the Demand stack and influence engineering standards company-wide. Challenge assumptions, propose alternatives, and define how Fleek builds software.
• Collaborate Cross-Functionally: Partner deeply with Product and Design to define what gets built. Work with data, AI, and operations teams to turn complex real-world logistics into reliable, scalable software., * Work model: In-office, typically 3-4 days per week. Full-time in the office for your first six months, then genuine flexibility earned through trust and performance.
• Level: Staff (L6)
• Stage: Post-Series B, hyper-growth
• Team: 100+ across London, India, and Pakistan (~20 in London office)
• Stack: Node.js, TypeScript, React Native, AI/ML integration
• Culture: High ownership, non-hierarchical, fast-moving. Founder-led with strong opinions loosely held., * Dream Big and Disrupt Yourself: Push the most ambitious version of what you're building. Step out of your comfort zone. Nothing is out of reach.
• Absolute Ownership: The buck stops with you. Drive initiatives to completion. Experiment, learn, persevere. The job isn't done until the job is done.
• Curiosity Leads the Way: Don't accept anything at face value. Ask questions you don't know the answer to. That's how you innovate.
• Talk to the Customer: Deeply understand their challenges, motivations, and ambitions. Every decision starts with the customer at the centre.
• Embrace Diversity: A global team building for a global supply chain. Bring your authentic self and embrace the diversity of everyone you encounter.

Do you have experience in TypeScript?, * 6-12+ years of professional software engineering experience. You've built and shipped production systems that handle real traffic and real money at scale.

• Prior Senior or Staff-level ownership of critical product systems. You've been the person responsible for a system that directly drove revenue or growth - not just a contributor.
• Full-stack in the real sense - UI to API to data to infrastructure. You can make informed decisions at every layer of the stack and understand how they affect each other.
• Strong fundamentals in system design, data modelling, and API architecture. You can design a service from scratch, reason about its failure modes, and explain the trade-offs to a product manager.
• Consumer or marketplace background. You've worked at a marketplace, ecommerce, or consumer product company. You understand what it means to build for end users at scale.
• Experience leading and developing engineers. You've managed or technically led a team. You know how to set standards, give feedback, and create an environment where people do their best work.
• Product engineering mindset. You can articulate the business problem your code solves. You've worked closely with product and design, and you've made trade-offs that balanced user experience with technical constraints.
• Startup or scale-up experience. You've worked in environments with fast deployment cycles, evolving requirements, and high ownership. You ship, learn, and iterate.
• AI first 10x-er. You think about your role as a 10x-er through the lens of AI. You've built AI capabilities either in your spare time or in deployment at scale.

Nice to Have

• Experience with Node.js and TypeScript (our primary backend stack)
• Familiarity with React Native and mobile development
• Experience building experimentation and analytics foundations

Ready to own the most commercially important function at a company tripling annually? If you want to set the technical standard for the organisation, lead a world-class team, and build the system that compounds growth - we'd love to hear from you.